Kaori is a detective who specializes in investigating infidelity. She is a skilled detective who has solved many difficult cases in the past by risking her life to force herself on men and fabricating evidence. She is asked to search for her colleague Ayumi. Ayumi's husband says that before she disappeared, she was groped on a train and was fascinated by the fingering technique. As Kaori begins to investigate the groping, a woman with a grudge appears before her...
